#include<stdio.h>
int main()
{
	int year, leap;
	printf("enter year:");
	scanf_s("%d", &year);
	if (year % 4 != 0)
		leap = 0;
	else if (year % 100 != 0)
		leap = 1;
	else if (year % 400 != 0)
		leap = 0;
	else
		leap = 1;
	if (leap)
		printf("%d is ", year);
	else
		printf("%d is not", year);
	printf("a leap year.\n");
	return 0;
}